Dryosaurus

Dryosaurus was a small plant-eating ornithopod dinosaur that lived in forests of western North America around 150 million years ago.^[1][2]

Dryosaurus Temporal range: Upper Jurassic 155–145 mya
Juvenile D. altus, Beneski Museum of Natural History
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Order:	†Ornithischia
Suborder:	†Ornithopoda
Clade:	†Iguanodontia
Genus:	†Dryosaurus Marsh, 1894
Type species
Dryosaurus altus (Marsh, 1878 [originally Laosaurus altus])
Other species
D. elderae Carpenter & Galton, 2018

Its family, the Dryosauridae, were precursors (ancestors) of the Iguanodons, and lived from the Middle Jurassic to the Lower Cretaceous.